I have been working out about 1 hour per day on a treadmill for the last 5 months. I am down 50 pounds, and my blood pressure and cholesterol are way down. Yesterday I saw a "free to a good home" eliptical trainer down the street. It appeared to be in good shape, so I loaded it up and took it home. This morning, in about 15 minutes, it kicked my butt. I was totally exhausted. Any advice on the correct usage of one of these machines would be appreciated. Thanks.